An 80 year old man was sitting on the sofa in his house along with his 45 years old highly educated son. Suddenly a crow perched on their window.

The Father asked his Son, “What is this?” The Son replied “It is a crow”. After a few minutes, the Father asked his Son the 2nd time, “What is this?” The Son said “Father, I have just now told you “It’s a crow”. After a little while, the old Father again asked his Son the 3rd time, What is this?” At this time some expression of irritation was felt in the Son’s tone when he said to his Father with a rebuff. “It’s a crow, a crow”.A little after, the Father again asked his Son the 4th time, “What is this?”

This time the Son shouted at his Father, “Why do you keep asking me the same question again and again, although I have told you so many times ‘IT IS A CROW’. Are you not able to understand this?”